JPS61251587A - Formation of inorganic coating - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application The present invention relates to a method of forming an inorganic coating. In particular, the present invention relates to a method of forming, for example, a waterproof, electrically insulating coating (eg, a protective coating) on a desired surface of a substantially heat-resistant object, such as a photovoltaic cell or an electronic device component.

Prior art and problems Conventionally, films such as the above-mentioned protective film have been formed using a vapor deposition method.

It is formed by sputtering method, application of inorganic paint, etc.

In methods such as vapor deposition or sputtering.

In addition to requiring special equipment or skill, they generally require long processing steps. If the film was insufficiently deposited, there was a risk that pinholes etc. would be generated. When using a paint film, there was a risk of pinholes and uneven film deposition. Furthermore, the upper surface and two sides of the plate-like object to which the coating is applied and/or
Alternatively, if a coating is to be formed on the required portions of the back side, a separate or two coating process using masking or the like is required. The various problems mentioned above have been successfully overcome by using a transfer sheet having a material that forms an inorganic film on the material sheet by heating.

That is, according to the present invention, a flexible transfer sheet 2 having a material layer 1' that forms an inorganic film by heating on a base sheet 3 is adhered onto a desired surface of a heat-resistant object such as a mineral object. The film-forming material layer 1' is applied and then heated to form the inorganic film 1. A method of forming a film such as an inorganic protective film is provided.

The film-forming material layer 1' of the transfer sheet 2 may be present on the base sheet 3 continuously or intermittently. If present intermittently, an intermittent or patterned coating can be formed accordingly. In addition, 2, for example, the upper surface 12 of the mineral plate-like object 5 and one side surface 1 of the plate-like object
3 or two opposing sides and/or the back side 14 adjoining the sides, the coating material layer 1' can be applied simultaneously using the transfer sheet 2.

The above-mentioned material that forms an inorganic coating by heating the coating material layer 1'2 typically refers to a material that forms a substantially glassy or dense sintered coating by heating such as firing. do. The method of forming a film such as a protective film according to the present invention is preferably applied to photovoltaic cells or electronic device parts, so in this case, the heat resistant temperature of the article to be coated (
For example, a material that forms an inorganic film by heating at a temperature of about 700° C. or lower, preferably about 600° C. or lower) is used.

As the inorganic film forming material, frit powder or
Examples include easily meltable materials such as glass powder, hydrophilic binder, and the like.

The transfer sheet 2 generally includes a base sheet 3. as illustrated in FIG. It consists of a film-forming material layer 1' and a protective sheet 4 such as release paper for protecting the material layer. The thickness of the material layer 1' is usually about 0.1 to 0.4 m, but is not particularly limited. As the base sheet 3, approximately 0.211
Flexible films such as combustible plastics having a thickness of 11 or less can be used. The base sheet may be a removable sheet, and may be peeled off and fired after being attached. In the case of a combustible and extinguishable base sheet, it is baked without being peeled off after being attached.

This is convenient because it burns and is destroyed.

What are the heat-resistant objects such as minerals that should be coated?

Typically, it is heat resistant at the heating temperature that forms an inorganic film. It refers to solid articles (for example, plate-shaped articles) made of materials such as ceramic products, glass, metals, and assemblies of these materials. Typical examples include photovoltaic cells and electronic equipment parts. Note that the surface of the object to be coated needs to be uneven or flat to the extent that the transfer sheet can be applied.

Actions and Effects Using a transfer sheet 2 having a material layer 1' which forms an inorganic coating by heating, the coating material can be easily and efficiently applied to the heat-resistant object to be coated. By firing this, an inorganic film 1 can be advantageously formed without fear of pinholes, uneven film deposition, etc. Therefore, the problems caused by the prior art described above can be solved through a simple process. The coating according to the invention is particularly useful as a gas-liquid barrier and electrically insulating coating.

Specific Embodiments The embodiments of applying the inorganic coating according to the present invention to solar cells are as follows:
Examples are shown below.

A glass protective film 1 was formed on the surface 12 of a solar cell as illustrated in FIG. In fig.

Substrate 6 is a ceramic tile approximately 100 mm on each side and 5 dew thick. Layer 7 is the glazed layer of the tile. layer 8
is an electrode layer made of In2O5, and this conductive layer extends to the ends of the two side surfaces 13 of the tile and the back surface 14 of the tile. Layer 9 is a CdTe-based P-type semiconductor layer. Layer 10 is a CdS-based n-type semiconductor layer. Layer 11 is a grid-like electrode layer made of a silver component.

3. A base sheet made of a plastic film of less than about 0.2 tyaa, as illustrated in FIG. Approximately 0.2
A flexible transfer sheet 2 consisting of a vitreous film-forming material layer 1' having a thickness of fi and a release paper 4 was used. After immersing the transfer sheet in water, the release paper 4 was peeled off, and the transfer sheet 2 was pasted onto the upper surface 12 and two side surfaces 13 of the solar cell. After thoroughly drying this, approximately 580
It was baked at ℃ for 30 minutes. A transparent glassy protective film was uniformly and completely formed on the upper surface and two side surfaces of the solar cell.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a transfer sheet to which an inorganic film-forming material is applied. FIG. 2 is a schematic cross-sectional view illustrating an embodiment in which an inorganic protective film is formed on a photovoltaic cell. 1... Inorganic coating, 1'... Film forming material layer, 2...
...Transfer sheet, 5...Photovoltaic cell. Patent applicant Inanox Co., Ltd. 1:! ! , Machine purchase plate 1': Covered melon material 2: Transfer sheet 5: Light basket road

Claims (2)

[Claims] (1) A flexible transfer sheet having a material layer on a base sheet that forms an inorganic film by heating is adhered onto the desired surface of a heat-resistant object to apply the film-forming material layer; then heating A method for forming an inorganic film, the method comprising: forming an inorganic film on the object. (2) The method for forming an inorganic coating according to claim 1, wherein the heat-resistant object is a substantially plate-like object.